Gfrktyl

I am trying to delete a few sections of a video using FFmpeg.

For example, imagine if you recorded a show on television and wanted to cut out the commercials. This is simple with a GUI video-editor; you just mark the beginning and ending of each clip to be removed, and select delete. I am trying to do the same thing from the command-line with FFmpeg.

I know how to cut a single segment to a new video like so:

ffmpeg -i input.avi -ss 00:00:20 -t 00:00:05 -map 0 -codec copy output.avi

This cuts a five-second clip and saves it as a new video file, but how can I do the opposite and save the whole video without the specified clip, and how I can I specify multiple clips to be removed?

For example, if my video could be represented by ABCDEFG, I would like to create a new one that would consist of ACDFG.

Well, you still can use the trim filter for that. Here is an example, lets assume that you want to cut out segments 30-40 sec (10 sec) and 50-80 sec (30 sec):

ffmpeg -i in.ts -filter_complex 

"[0:v]trim=duration=30[a]; 

 [0:v]trim=start=40:end=50,setpts=PTS-STARTPTS[b]; 

 [a][b]concat[c]; 

 [0:v]trim=start=80,setpts=PTS-STARTPTS[d]; 

 [c][d]concat[out1]" -map [out1] out.ts

What I did here? I trimmed first 30 sec, 40-50 sec and 80 sec to end, and then combined them into stream out1 with the concat filter.

About setpts: we need this because trim does not modify picture display time, and when we cut out 10 sec decoder counter does not see any frames for this 10 sec.

If you want to have audio too, You have to do the same for audio streams. So the command should be:

ffmpeg -i utv.ts -filter_complex 

"[0:v]trim=duration=30[av];[0:a]atrim=duration=30[aa];

 [0:v]trim=start=40:end=50,setpts=PTS-STARTPTS[bv];

 [0:a]atrim=start=40:end=50,asetpts=PTS-STARTPTS[ba];

 [av][bv]concat[cv];[aa][ba]concat=v=0:a=1[ca];

 [0:v]trim=start=80,setpts=PTS-STARTPTS[dv];

 [0:a]atrim=start=80,asetpts=PTS-STARTPTS[da];

 [cv][dv]concat[outv];[ca][da]concat=v=0:a=1[outa]" -map [outv] -map [outa] out.ts

I can never get ptQa's solution to work, mostly because I can never figure out what the errors from the filters mean or how to fix them. My solution seems a little clunkier because it can leave behind a mess, but if you're throwing it into a script, the clean up can be automated. I also like this approach because if something goes wrong on step 4, you end up with completed steps 1-3 so recovering from errors is a little more efficient.

The basic strategy is using -t and -ss to get videos of each segment you want, then join together all the parts for your final version.

Say you have 6 segments ABCDEF each 5 seconds long and you want A (0-5 seconds), C (10-15 seconds) and E (20-25 seconds) you'd do this:

ffmpeg -i abcdef.tvshow -t 5 a.tvshow -ss 10 -t 5 c.tvshow -ss 20 -t 5 e.tvshow

or

ffmpeg -i abcdef.tvshow -t 0:00:05 a.tvshow -ss 0:00:10 -t 0:00:05 c.tvshow -ss 0:00:20 -t 0:00:05 e.tvshow

That will make files a.tvshow, c.tvshow and e.tvshow. The -t says how long each clip is, so if c is 30 seconds long you could pass in 30 or 0:00:30. The -ss option says how far to skip into the source video, so it's always relative to the start of the file.

Then once you have a bunch of video files I make a file ace-files.txt like this:

file 'a.tvshow'

file 'c.tvshow'

file 'e.tvshow'

Note the "file" at the beginning and the escaped file name after that.

Then the command:

ffmpeg -f concat -i ace-files.txt -c copy ace.tvshow

That concats all the files in abe-files.txt together, copying their audio and video codecs and makes a file ace.tvshow which should just be sections a, c and e. Then just remember to delete ace-files.txt, a.tvshow, c.tvshow and e.tvshow.

Disclaimer: I have no idea how (in)efficient this is compared to the other approaches in terms of ffmpeg but for my purposes it works better. Hope it helps someone.

Although the answer provided by ptQa seems to work, I have developed an other solution which has prooved to work fine.

Essentially, what I do is to cut one video for each part of the original video that I want to include on my result. Later, I concatenate them with the Concat Demuxer explained here.

The solution is the same that waht I have tried first and presented sync problems. What I have added is the command -avoid_negative_ts 1 when generating the different videos. With this solution, the sync problems dissapear.

I made a script to speed up editing recorded TV.
The script asks you for the beginning and end times of segments you want to keep and splits them out into files. It gives you options, you can:

• Take one or multiple segments.


• You can combine the segments into one resulting file.


• After joining you can keep or delete the part files.


• You can keep the original file or replace it with your new file.

Video of it in action: here

Let me know what you think.

 #!/bin/bash

/bin/date >>segmenter.log



function segment (){

while true; do

    echo "Would you like to cut out a segment ?"

    echo -e "1) Yesn2) Non3) Quit"

    read CHOICE

    if [ "$CHOICE" == "3" ]; then

        exit

    elif [ "$CHOICE" == "2" ]; then

        clear

        break

    elif [ "$CHOICE" == "1" ]; then

        clear

        ((segments++))

        echo "What time does segment $segments start ?"

        read SEGSTART

        clear

        echo -e "Segment $segments start set to $SEGSTARTn"  

        echo "What time does segment $segments end ?"

        read SEGEND

        clear

        echo -e "Segment $segments end set to $SEGENDn"

        break

    else

        clear

        echo -e "Bad option"

        segment "$segments"

    fi

done

if [ "$CHOICE" == "1" ]; then

    echo "Cutting file $file video segment $segments starting at $SEGSTART and ending at $SEGEND"

    ffmpeg -i "$file" -ss $SEGSTART -to  $SEGEND -map 0:0 -map 0:1 -c:a copy -c:v copy  "$filename-part$segments.$extension"  >> segmenter.log 2>&1

    clear

    echo -e "Cut file $filename-part$segments.$extension starting at $SEGSTART and ending at $SEGENDn"                             

    segment "$segments"

fi

}



file="$1"

filename="${file%.*}"

extension="${file##*.}"

clear

segments=0

segment "$segments"

clear

if (("$segments"==1)); then

mv $filename"-part1."$extension "$filename-segmented.$extension"

elif (("$segments">1)); then

echo "Would you like to join the segments into one file ?"      

       OPTIONS="Yes No Quit"

       select opt in $OPTIONS; do

       clear

        if [ "$opt" == "Quit" ]; then

            exit

        elif [ "$opt" == "Yes" ]; then

            clear

            echo "Joining segments"

            ffmpeg -f concat -i <(for f in $filename"-part"*$extension;         do echo "file '$(pwd)/$f'"; done) -c:a copy -c:v copy "$filename-segmented.$extension" >>         segmenter.log 2>&1

            clear

            echo "Would you like to delete the part files ?"

            select opt in $OPTIONS; do

            clear

            if [ "$opt" == "Quit" ]; then

                exit

            elif [ "$opt" == "Yes" ]; then

                for f in $filename"-part"*$extension; do rm $f; done

                break

            elif [ "$opt" == "No" ]; then

                break

            else

                clear

                echo -e "Bad optionn"

            fi

            done

            break

        clear

        elif [ "$opt" == "No" ]; then

            exit

        else

            clear

            echo -e "Bad optionn"

        fi

    done

fi

echo "Would you like to replace the original file with the result of your changes ?"

OPTIONS="Yes No Quit"

select opt in $OPTIONS; do

    clear

    if [ "$opt" == "Quit" ]; then

        exit

    elif [ "$opt" == "Yes" ]; then

        rm $file

        mv "$filename-segmented.$extension" $file

        break

    elif [ "$opt" == "No" ]; then

        break

    else

        clear

        echo -e "Bad optionn"

    fi

done